This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A069287 #14 Feb 16 2025 08:32:46 %S A069287 0,2,10,2,1,17,3,1,12,6,6,2,2,1,7,1,6,1,15,2,1,1,2,1,1,1,2,4,1,6,1,1, %T A069287 1,4,14,2,10,1,3,3,4,1,2,1,8,7,1,12,2,1,1,1,6,4,2,1,2,1,2,1,3,1,7,4,2, %U A069287 1,7,1,1,2,35,1,13,13,1,2,9,8,1,1,11,2,3,12,15,1,4,2,2,1,2,2,7,1,3,3 %N A069287 Continued fraction for rho with erf(rho) = 1/2 = erfc(rho). %H A069287 G. C. Greubel, <a href="/A069287/b069287.txt">Table of n, a(n) for n = 0..5000</a> %H A069287 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Erf.html">Erf</a>. %H A069287 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Erfc.html">Erfc</a>. %e A069287 0.4769362762044698733814183536431305598089697490594706447... %t A069287 ContinuedFraction[InverseErf[1/2], 50] (* _G. C. Greubel_, Apr 22 2018 *) %Y A069287 Cf. A069286 (decimal expansion). %K A069287 nonn,cofr %O A069287 0,2 %A A069287 _Frank Ellermann_, Mar 14 2002